Dental casting machine



July 1, 1930.

J. A. PHILLIPS DENTAL CASTING MACHINE Filed Feb. 16, 1929 IN V EN TOR.

U R m vm. AH fl Patented July 1,1930

ESIP AT Em TFFICE JoHN ADAM rHILLIPsfoF woonsInE, NEW YonK,' ssIGNoR TOBonus DENTAL V CASTING 'MAcnINncoi/rrnnY, Ind, on FLUSHING, NEW YoRI Aoo-R'Pomvrron or NEW Yonx V DEnTAL oAsTINeMAcHInE Application filedFebruary 16, 1929. 'S.eria1-No.',340,3 54.

This invention relates to dental'casting machines suchas are used bydentistsin casting plates,,bridges, inlays or other restorations.

In machines of the character specified, a

cap is used for closingthe flask-inwhich the casting is to be'formed andcomp'ress'edair is admitted to thelcap for the purpose of insuringaperfect casting and forcing the metal into all port-ions, of the moldcavity.

-The invention has for its salient object to provide a simple andpractical construction of castingmachine ofthecharacter specified and,furthermore, a machine capable ofadjustment for use with difierentsizesoffiasks.

Another object of the invention is to pro- Vide a machine of thecharacter specified, so constructed-and: arranged that the cap whichfits over the top of the flask can readily aline itself with the planeof the upper edge of the flask body. I

Further objects of a part of this application, and in which Fig. 1 is anelevational view, partly in section, showing a casting machineconstructed Y t and a mold cavity of the desired form and in accordancewith the invention;

Fig. 2 1s a sectional ele'vatlon taken sub- 1 stantially. on'line 22 ofFig. 3;

taken s'ubstantiallyon line 8-301 Fig. 2; Fig. 4 is a sectionalelevation taken through the cap or cover which .'Fig.' 3 but showing theair valve,for admit.

Fig. is a transverse sectionalelevation top of the flask;and

ting air to the flask, open. Y

The invention briefly described consists of. a casting machine having asupport for, a. flask and a cap adapted to fit over the top of theflask. The cap is conne ted through suitable valve mechanisms to acompresed'airsupply, and means is provided for pressing the cap againstthe top of the flask and admitting,

-- air to the flask to force the gold or other metal i beingcast intothecavity of the desired con- ,formationin the flask. The means formoving thecapis so constructed and arranged as ;to provide a strongleverage and, further- .more, is so arranged that the; cap will autotheinvention, will appear from the following specification taken 1nconnection with the drawings, which form having an upper edge 22. v p nThe flask 20 is invested with suitable mold fits over 1 the L ig. 5 1s asectional elevation similar to I matically adjust itself to e positionin alinement with the top of the'flaskand maybe adjusted in such amanner as to be used with flasks of different sizes and heights.

urther details of the invention, will ap pear from the followingdescription. V In the form of the invention illu'stratedfin thedrawings, the machine. comprises a jbase 10 on which is mounted .a pump,11, acornpressed air .tank 12, and afsupporting base The Supporting base13 for the fiask'h'as threaded opening thereinin which is threaded apost 16 on which is mounted a table17.

is supported on thetable 17 and has an open ing 21in the bottomthereofand an open, top

'The table 17 is preferably provided witha plurality of openings 18vtherethrough, I

,.70 vA dental fiask20 of the usual construction L forming'material,such as plasterof Paris,

shapeis formed in theinvestiture. Molten metal is placed in the moldcavity and a cap is then placedover the moldand compressed air isadmitted through thecap to the mold,

thus forcing the molten metalto completely fill the cavity in the flask.i d x In the form .of the invention illustrated, a-

cap 25 for closing the upper end of themold is. provided with an 'ipwardlyeXtending threaded sleeve Zdwhich is threadedinto a sleeve 27formed on the. lower end of a tube 28. The tube 28extendsupwardlythrough a collar 29 which is mounted for limit'edjpiv;

are pivotedin allevergl. The lever 31 ,is pivotally connected at.,32 toablock 33, which in turn is slidablymoiint ed on 'a vertical postf34carried by the sup; f porting base 13. The lever 31 is also pivoted atthe rear end thereofto; a pair oflinksi tO which are pivoted at theiropposite ends to a spindle 41,mounted ina block 42 which is threaded ona'threade d portion 43 of the post,

otal movement on trunnions 30, which intiirn .34. The blockis verticallyadj us table'on the post and after being adjusted to the desiredheightis held from rotation by a set screw 44,

. the inner end ofwhich enters a'slot 45 formed in the post. A look nut46 also holds the block in adjusted position."

' A y desired form oivalve control mecha- 'nism'may be used inthemachine and in the Q 51' formed in a tubularvalve casing 52 which jtheupp n zend thereof and a collar, 56 suris threaded into the upper endof the collar 29. -A packing washer 53 surrounds the tubular member 28and is positioned bet-ween I the thi'eadedendof 'thecasing 52 and thebottom of therecess in the collar 29 into which the casing iisithreaded.

LjT i tubular member 28 has a spindle 55.

connected to and extending. upwardly from round'sthe spindle andseatsagainst the upend l m mber 28. "A nut54 isithreaded on the' spindle 55and holds the collar 56in position and a packing washe'rGO is preterablyinterposed between the-nut and thecollarQ A spring 61 is mounted inthe 1casing chamber 51 1 and seats at one end and at the other endagainst thenut 54:. a

I fWhen the lever 31 and the cap are notin operativep osition or, inother words, when the cap 25 is not disposed in engagement with theupper edge 220i the flask, the tubular 3 the spring 61 to the positionshown in Fig.3", in which thelateral openings are closed; xHowever, whenthe lever is swung downmember 28wil1fbe pressed downwardly by wardly andthe cap 25 is pressed againstthe upper edge 22 of theflask .20,"thetube'28 will.

. betorced upwardly, thus placing the ports or openings 50 incommunication with the cham 'ber'51. The upper end of the chamber has aI tubular'extension 65' which isconnected by'a ghose 66 to thecompressed aintank 12. I

I The cap 25 is preferably provided with an annular recess 70 which isdisposed an annular packing 71 of suitable material, such, as

. asbestos fiber: The central portion of the j the cap 25.1%", e V

T e-,machihe; o crates in the following manner: When a" ask having amold, therein" bottomof' the ca'p25 has an annular wall 72 l 1 having arecess 73 communicating with a cenfilial opening 7 4 inwhich ispositioned a thimthe ,5 h v ng new Op ng 76 at s lower a-flange 7 7atits upper end. The, rfla'ngef'fi seats "against tl ilpp r end oftheT'threaded sleeve26 and when-the sleeve. is 1; threaded into the sleeve27 the flange ofthe u r is'securely clampedbetweenthe upf perendofthe'sleeve26 and theend of the jopeningfin the sleeve27; Apackingwasher :78 ispreferably-positioned. between the lower en 0 f thesleeve27 and theupper surface of is positioned on the table 17, and thetable ,has'been adjusted to the proper height and Y' the block 42 hasalso been properly adjusted,

the lever 31 is swung downwardly to the posi tion shown in dotted linesin Fig. l, and pressure; is exertedthereom causing. the valve ports 50to communicate with'the chamber 51. Air from the compressedair tank willpass through the chamber. andvalve ports and downwardly thro ugh. thetube,28; and thimble 755mm the flask. The compressed air-iromjthe tank12 will cause the molten metal in the flask to be forced into the moldcavity, thus completely filling the cavity. Should the operator desireto use a flask of different "height, 'the'table 1 7 or block 42 can beadjusted to properly position the cap 25. The pivotal mounting of thecap in the lever pe'rmits'the cap to properly aline itself withthe top22 o'fthe flask. j I i Although one specific embodiment of the inventionhas been particularly shown and described, it'will bejunderstoodthatthevinventio n is capable otmodification and that changes in theconstruction and'in the ar- 'rangementjof the-various cooperating partsmay' bemade without departing from the spirit or scope of-the invention,asexpressed gainstthe up er end of the casing. chamber" T What I claimisz in thefollowing claims 'y i 1. A. dental casting machinercomprisinga' flask support, a flask on said supporfla compressed air supply tank,valved means for conducting air fro-mthe tank to said flask 1 andconstructed to spray the airinto the" flaslg; said means including; apivotally mounted cap adapted to'fit over the top of the fla'sk,= meansfor moving said cap into engagement with andaway from the flask, saidmeans being e'fl'ective to open andclose the valved means, and meansconnected there to for supporting and' vertically guiding said'movingmeans. I Y

2; A dental casting-machine 'comprjisinga flask support, a flaskthereon,' a cap adapted" d to fit over and close the upperend of saidflask, a valveftube in said cap having perforations; adj acent one endfor establishing communication with the interior ofthe flask andconnected at its other 'endto asource ofc'ompressed air, a lever; "andmeans pivotally connecting saldlever and saidfcapwhereby thelever willmove the-cap into and out of engagement withsaid*flask,'said means andcap being relatively movable to pro vide a valve Eac'tionin said tube.

3. A dental casting machinecomprising a flask support, a flask thereon,a cap adapted to fit over and close the upper end of said flask, avalvetubein said cap having perforat1ons adJace'nt one end forestablishingcommunication with the interior of the flask and connectedatits' other end to a source of compressed air, a lever'connected tosaidcap and adapted to move the cap into and out'of' en gagement withsaid flask and to open and close the valve of said tube, a linkconnected to said lever, a vertically adjustable pivot for said link andmeans connected thereto for supporting and guiding said lever formovement in a vertical plane.

4:- A dental casting machine comprising a flask support, a flaskthereon, a cap adapted to fit over and close the upper end of saidflask, a valved tube in said cap having per- 7 I forations adjacentoneendvfor establishing communication with the interior of the flask andconnected at its other end to a source of compressed air, said capbeing'recessed adjacent the perforations thereby to deflect the airthroughout the flask as itis sprayed, means connected to the cap to movethe same into andout of engageinent With the flask and to control thevalve of the tube, and means for supporting and guiding said last namedmeans.

JOHN ADAM PHILLIPS.

